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KMA200,115

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33
KMA200 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 8 — 7 December 2011 19 of 33
NXP Semiconductors
KMA200
Programmable angle sensor
12.3 Temperature drift
The temperature drift is defined as the envelope deviation of the angle value over the
temperature range. It is considered as the pure thermal effect.
Following mathematical description is given for temperature drift value:

T
=
meas
(
ref
,T
j
) 
meas
(
ref
,T
k
)
: temperature drift, deviation over temperature in degree

lin
: linearity error measured at different temperatures in degree
T
j
, T
k
and T
m
: any ambient temperature in the specified range (T
amb
)
Fig 9. Temperature drift behavior
006aaa304
temperature T
m
temperature T
k
temperature T
j
ϕ
ref
(°)
Δϕ
T
Δϕ
lin
(°)
KMA200 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 8 — 7 December 2011 20 of 33
NXP Semiconductors
KMA200
Programmable angle sensor
12.4 Microlinearity
Microlinearity is the deviation between the device output and the reference line at any
angle and for an angle step of 1. The microlinearity is determined at a constant
temperature.
The microlinearity is calculated as follows:

lin
=V
meas
(
ref(i+1)
) V
ideal
(
ref(i+1)
)
V
ideal
(
ref(i+1)
)=V
meas
(
ref(i)
)+m
ideal
1 =V
meas
(
ref(i)
)+0.5%V
DD

lin
: microlinearity
V
meas
(
ref(i)
): measured voltage [%V
DD
] for angle position
ref(i)
m
ideal
: ideal, theoretical slope; with 90 %V
DD
and maximum angle 180
The output slopes are monotonic by design. This figures can also be used for the
definition of 
lin
in digital mode, as follows: assume that
V
meas
(
ref(i)
)=
meas
(
ref(i)
) and V
meas
(
ref(i+1)
)=
meas
(
ref(i+1)
),
whereas
meas
(X) is the output angle of the KMA200 at the angle position X.
Fig 10. Microlinearity behavior
006aaa305
voltage
V
meas
(ϕ
ref(i+1)
)
V
ideal
(ϕ
ref(i+1)
)
V
meas
(ϕ
ref(i)
)
theoretical slope m
ideal
starting at output
V
meas
(ϕ
ref(i)
)
Δϕ
ref
= 1° =
|
ϕ
ref(i)
− ϕ
ref(i+1)
|
angle
Δϕ
μlin
KMA200 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
Product data sheet Rev. 8 — 7 December 2011 21 of 33
NXP Semiconductors
KMA200
Programmable angle sensor
12.5 Hysteresis
The hysteresis error is defined as the maximum difference between angle values given by
the device output when performing a positive (clockwise) rotation and negative rotation
(counter clockwise) over an angle range of 180.
The hysteresis error is defined as follows:

hys
= 
meas
CW(
ref
) 
meas
CCW(
ref
)

hys
: hysteresis
meas
: CW measured angle for clockwise rotation
meas
: CCW measured angle for counter clockwise rotation
13. Programming
The KMA200 comprises two major modes of operation. These modes are:
13.1 Normal operation mode
This is the default mode. The KMA200 starts in this mode without the need of writing to
the serial interface. In this mode a continuous conversion of the input signals into the
corresponding angles takes place. This mode is configured with the on-chip EEPROM.
Once in normal operation mode, the KMA200 can be reactivated for command mode only
by a new power-on reset.
Fig 11. Hysteresis
006aaa306
180
180
ϕ
meas
(°)
ϕ
ref
(°)
Δϕ
hys
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KMA200,115

Mfr. #:
Buy KMA200,115
Manufacturer:
NXP Semiconductors
Description:
Motion & Position Sensors Board Mount Motion & Position Sensors SNSR MAGNETIC TAPE-7
Lifecycle:
New from this manufacturer.
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